Sudden, terrible lag for all player except me

I started up my server today for the first time in a week or so and updated it to build 935 and all of the other players are experiencing terrible, crippling lag. I haven't changed anything from the previous time I ran it.

EDIT: after making this post, I downloaded the plugin GiantTrees

I run it from my laptop, Windows 7 64-bit
I'll put my plugins in a different post

anticreeper-prevents creepers from spawning
autosave
blacksmith-iConomy weapon repair
blastpick-fast removal of blocks when enabled
bMobs-command to kill all mobs
simplechestlock-locks chests
clayflow-water/lava makes clay instead of cobble
codelock(removed from bukkit.org)-buttons can have password for use
evercart-storage minecarts load chunks for long-distance transport
fencestack-fences stack normally
iConomy
localshops-plugin for shops
a logger(just named logger, not sure which specific one)
mobBounty-money for killing mobs
Mobrider- saddles can be used to ride any mob/player
paintingswitch-switches paintings using the scrollwheel, hasn't worked recently
permissions
PlgColdLightning-lightning doesnt cause fire
PvP control-people can decide whether or not they want to use PvP
SaddleBack-killing a pig with a saddle drops a saddle
secretdoors- can create secret doors behind blocks
simplehome-for teleporting home
spyer-invisibility/fake logoff for moderators/admin
stackable-makes more items stack(food, buckets, etc)
unlimitedlava-creates pools of infinite lava
vStopfire-fire doesnt spread
weatherman-weather control/lightning shooting

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

@Jet9

Was this problem only happening now, or was it a recurring issue before?
Specs of your laptop?
Your laptop is connected via cables/wireless?
And also, internet speed?